Snowplow



Oct. 9, 1928.

v. P. MARRAN SNOWP LOW Filed Jan. 1927 2 Sheets-Sheet a 7 W INVENTOR.

ATTORNEYS.

Oct 9, 1928.

v. P. MARRAN SNOWPLOW Filed Jan. 6, 1927 2 Sheets-Sheet INV ENTOR.

I BY [7% 4 *ia A TTORNEYS.

Patented Oct. 9, 1928.

warren STATES PATENT orrice.

SNOWPLOW.

Application filed January 6, 1927. Serial No. 159,375.

This invention relates to snowplows and,

more particularly to elevating means there-.

for, whereby the plow may be moved to lie closer to or farther away from the ground, as desired.

One object of the invention is to provide a structurally improved plow elevating means of the parallel links type, designed for use with large and heavy plows, which are called on to perform heavy duty.

Another object of the invention is to provide plow elevating means of a type such that the plow propelling means may be used to supply the force necessary to elevate the heavy plow, as by blocking the runners to which the elevating links are connected and then effecting the elevation of theplow by moving it longitudinallyforward or back ward as the case may be. I

Another object of'the invention is to-provide, in a plow elevating means of the p arallel links type, a latching or holding means for holding the links in elevated position (also in lowered position if and'when desired), such latching means being also designed to effectivelybrace the pivotally connected parts of the elevating means and lend rigidity to the same.

Other objects and advantages will appear from the following description and will be pointed out in the appendedclaims.

The invention will be disclosed with reference to the one illustrative embodiment of it in the accompanying drawings, in which Figs. 1 and 2 are plan and sideelevational views respectively, of a snowplow embodying the invention; 7

Fig. 3 is a sectional elevational' view, drawn to a larger scale and illustrating the elevating device in one of its positions;

Figs. 4 and Sam cross-sectional views taken on the lines H and 5-5, respectively, of Fig. 3; and

Fig. 6 is a view taken similarly to Fig. 3 but showing the elevating device in another of its positions.

Referring to these drawings; the invention may be applied to any suitable type of snowplow and that type shown herein is given merely by way of illustrative example. As shown, the plow 10 is of the V-shape type and has fixed thereto a pair of laterally spaced side frames 11, by which the plow is adapted to be pushed from a suitable tractor disposed between said frames; The

frame of the plow also includes suitable braces 12 and" three pairs of laterally spaced, parallel angle irons 13 which are disposed longitudinally of the plow and parallel with its line of travel, 1

Each pair of angle irons serves to support one of the elevating devices of this invention. Of course, there may be as many of these elevating devices as is necessary ordesired and the number and disposition of these devices will naturally be variedto suit the particular plow with which they are used. In the present case, three elevating devices are used. Th'esedevices are designated generally by reference letter E in Fig. 1 and as there shown, one is located centrally of and well up toward the point of the plow, and the other two are located near opposite sides of the plow and rearwardly of the central device. uted in the bestmanner to'etfectively raise the heavy plow. It is preferred, although it is not necessarily essential for all purposes, to provide a series of fixed runners The devices are thus distrib- 14 suitably supported from the plow frame.

-One of the elevating devices is shown in Figs. to 6 inclusive. It includes a shoe or runner 15 having a broad flat bottom surface to contact with the ground and up wardly rounded ends. The runner in cross section is of inverted T-shape and has a central upstanding web 16 which is straddled by the lower forked ends of two links 17 and 17. These links at their lower ends are pivotally connected at longitudinally spaced points to web16 by pins 18 and 18, and extend upwardly, being received between the pair of angle irons 13, as shown in Figs. 4 and 5. The upper ends of links 17 and 17 are .pivotally connected to the angle irons 13 by pins 19 and 19 in such a way that the two links are parallel. These links serve to elevate the angle irons 13, and thus the plow, from a position such as shown in Fig. 6 to a position such'as shown in Fig. 3. By blocking the runner 15, .as indicated at B in Fig. 6, and then backing the plow to cause the angle irons 13 to move inthe direction of the arrow shown in Fig. 6, thefan'gle irons will be elevated in an obvious manner.

In orderto hold the elevating links'in either of their two extreme positions, a latch lever 20 is provided. This lever has a forked shaped end formed by two posed one on each side thereo which plates are secured to the lever by rivets 22. As

lates 21, disof wh'ch is adapted to freely receive pin 19.

Normally, pin 19 lies in notch 25, whereby the runner 15 is held in its lower position .I and with its ground engaging surface disposed in the same plane as that in which the corresponding surfaces of the fixed runners are disposed. When, however, runner 15 is blocked, as described, an operator lifts lever 20, prior to the backing of the plow, until pin 19 lies outside notch 25, whereupon the plow is backed and lever 20 is allowed to drop, bringing a smooth part of its lower edge into contact with pin 19, so that when the links 17 and 17 reach their vertical posi tions the lever 20 will drop and engage pin 19 in notch 24. To lower the plow, the front ends of the'runners 15 are blocked and lever .is lifted to free pin 19 from notch 24, after which, aided by a slight forward push of the plow if necessary, the plow will drop. If levers 20 are dropped back so as to ride on pins 19, before the plow reaches its lower position, the pin 19 will automatically engage in notch 25 at the end of the lowering operation.

l/Vhile links have been used heretofore as elevating devices, the particular way in which a link elevating mechanism has been worked out for a heavy duty plow of the type illustrated, is thought to be important and novel. The location of the links so that they closely fit between the frame members 13 and the straddling of the web of the runnor by the lower ends of the links, provides a rugged construction calculated to withstand the heavy lateral shocks to which they are subjected when the plow is used for heavy duty service. The links, when in elevated position, abut the angle irons for about half their length and are held from lateral deflection relatively to the plow frame. Only that part of each link which is exposed below the angle irons and above web 16 is free to bend under a lateral shock. The bending moment is thus reduced to as low a figure as is possible compatible with the degree of plow elevation desired.

The latching means is also thought to be novel and important. It is simple, foolproof and easily operated, even by the unskilled. Yet it is husky and rugged and Well calculated to function properly under the stress of heavy duty, snowplow service.

This latching device not only holds the links elevated but it has an important bracing effect by reason of its diagonal disposition relatively to the four sides of the parallelogram formed by the frames 13,'shoe 15 and links 17. An obstruction encountered by the front end of runner 15 imparts a shock thereto and this shock is transmitted to the frames '13 by the diagonal latching brace 20, thus saving the links 17 and 17 frominuch of the strain. to which they might otherwise be subjected.

The latching and bracing effect of the bar 20 can obviously be equally well obtained even if the bar is pivoted to shoe 15 at some other point than at pivot 18 and even if the notch therein engages some other but similar part on frames 13 than-the pivot '19. Such an arrangement would be functional-ly the equivalent of that illustrated and within the scope of the broader features of this invention.

Theinvention has been disclosed herein,

in an embodiment at present preferred, for,

illustrative purposes, but the scope ofthe invention is defined by the appended claims ratherthan by the foregoing description.

What I claim is:

1. An elevating device for a snowplow, comprising, in combination with the snowplow frame, a ground engaging shoe, spaced parallel links connecting the shoe to the frame and pivotally connected to each, and latching means for holding the links in elevated position comprising a bar pivoted to the shoe near one end for swinging movement independently of the frame and adapted to be swung into a position in which it extends upwardly and rearwardly and is detachably held by a latching engagement to the snowplow frame.

2. An elevating device for a snowplow, comprising, in combination with the snowplow frame, a ground engaging shoe, spaced parallel links connecting the shoe to the frame and pivotally connected to each, and latching means for holding the links in elevated position comprising a bar pivotally mounted on the pivot, by means of which the lower end of one link is connected to the shoe, and extending upwardly and .rearward- 1 ly for detachable and latching engagement with the pivot, by means of which the upper end of the other link is connected to the snowplow frame.

8. An elevating device for a snowplow, comprising, in combination with the snowplow frame, a ground engaging shoe, spaced parallel links connecting the shoe to the frame and pivotally connected to each, and latchin means for holding the links in elevatec position comprising a bar pivotally mounted on the pivot, by means of which the lower end of one link is connected to the shoe, and extending upwardly and rear slotted to receive said bar and the latterv having a notch to receive the last named pivot.

4. An elevating device for a snowplow,

, comprising, in combination with the snowplow frame, a ground engaging shoe, spaced parallel links connecting the shoe to the frame and pivotally connected to each, and a bar pivotally mounted on the pivot, by means of which the lower end of one link is connected to said shoe, and extending upwardly and rearwardly to overlie the pivot, by means of which the upper end of the other link is connected to the snowplow frame, said bar having a plurality of spaced notches in its lower edge in any one of which the last named pivot may be received for holding the links in different positions and the plow at different elevations. I

5. In a snowplow having two spaced parallel frame'members, a ground engaging shoe having an upstanding web, a pair of parallel links, the lower ends of which straddle said web and are pivotally connected thereto and the upper ends of which are received and closely fit between said frame members and are pivotally connected thereto, whereby when said shoe is blocked and the plow moved longitudinally relatively thereto, the plow will be elevated, and means for holding said link against pivotal movement to thereby. hold the plow in elevated 'position. c

In testimony whereof I have aflixed my signature.

VINCENT P. MARRAN. 

